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Article #1340

80387 computation (how to question)

#1340
From: Glenn Geers
Date: Wed, 19 Jun 1991 02:30
23 lines
1704 bytes
Hi,
	I've written most of the UNIX math library routines in 386/387 assembler
in order to get more bang for my buck. However, there is one that has eluded me
so far (at least efficiently) and thats exp(x)-1. The 387 has an instruction
for doing 2^x - 1 but I can't see a neat way of scaling the result or prescaling
the input. Anyone know how?

Thanks in adavnce,
	Glenn
--
___________________________________________________________________________
Glenn Geers                       | "So when it's over, 
                                  |  we're back to people.
Department of Theoretical Physics |  Just to prove that human touch
The University of Sydney          |  can have no equal."
Sydney NSW 2006 Australia         |  - Basia Trzetrzelewska, 'Prime Time TV'
                                  |
Phone: +61 2 692-3241 (voice)     |_________________________________________
       +61 2 660-2903 (fax)       |
                                  |
glenn@qed.physics.su.oz.au        | #include <standard_disclaimer.h>
                                  |
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From: glenn@suphys.physics.su.OZ.AU (Glenn Geers)
Newsgroups: comp.sys.intel
Subject: 80387 computation (how to question)
Message-ID: <1991Jun19.023041.25008@metro.ucc.su.OZ.AU>
Date: 19 Jun 91 02:30:41 GMT
Sender: news@metro.ucc.su.OZ.AU
Reply-To: glenn@suphys.physics.su.OZ.AU (Glenn Geers)
Organization: School of Physics, Uni of Sydney, Australia.
Lines: 23
Nntp-Posting-Host: physics.su.oz.au